Resistance-coil.



I. MARCUS.

RESISTANCE COIL.

APPLICATION FILED sift. 1 1. m r.

1,268,374. Patented June -1, 19181 nu'i'n'l'um k MAL Hnm} i 344 van to: lxlm fiz-aezl arcas =3- M a5 I Q tains o'make and use the same.

Isnanr. MARCUS, or wm'rn aor, MASSACHUSETTS.

BESISTANEIE-COHIL.

Speciflcatien of Letters Patent.

Patented June 4,1918.

Application flied September 17, 1917. Serial No. 191,831.

To all wh m2; wwgconcerak f Be it, npwi} ,that' zl, ISRAEL Mancus, a 'citizen-of the United States, residing at Winth 0p, in the cpunty. of Suffolk and tate f Massachusetts, have, invented cerain new. and usefulilmprovement's in Resist ce-Coils'; and -I file d'clare'th? following 0" be a full, clear, and exact description' 0 the inveption, such as will enable others skilled in the art to which it apper- This inventio relates to resistance coils adapted to be usedias regulators in lighting systems of automobiles in which the current used is produced by a etierator attached to the'engme shaft where y, when the engine is Speeded up the voltageiwill be increased cau'sing the 11 hts to rise rind fall according to the speed 0 the engine:

A further object of my invention is to provide a choke coil to be used in connec-.

tion with the lighting system as described that will prevent this flickering of the lights.

It is my intention to provide a coil which can be adapted to be usedona variety of circuits having difi'erent voltages.

A further object of the invention is'to provide a device of this character in which construction is provided whereby overheating of the coil will be same time all parts t on hly insulated. 4 4

n additional object of the inven ion is to provide in a device of this charact'fin novel form of niountingand insulation for a resistance coil and one which will be ea to manufacture, simple to apply an wh ic will at all times produce its maxi utri o'f efficiency. With these general objects in vibwfand ordinate, which will appear with others 'su in the descriptiomjmy invention resides m the novel construction, combination and arran ement of parts, to be more fully hereina r described and claimed and taken in connection with'theraccompanying drawin forming 11i patt ofi'this specification, and in rev Ltd a at the erebzi will h e thorably engaged in the end of extending, centrally disposed bodiment of my invention comprises a pubstantially hollow, cylindrical shell or casmg 1, which is formed preferably of hard rubber but may be composed of any suitable insulating material as desired. The interior of the casing is provided with a central cylindrical bore for about two-thirds of its length as clearly illustrated in Fig. 2 so as to provide for the reception therein of a resistance coil 2, to be described.

One end of the casing will be leftopen while the opposite end 3, will be closed. Centrally disposed, and extending longitudiiially through the closed end portion 3, of the casing, is a connector bushing 4, which in this instance comprises a brass tube for receiving a terminal wire of the lighting circuit in which the device is to be utilized. A laterally extending set screw 5 is disposed through the casing and projects into the tube 4, providing means for clamping an end of the wire in the tube and it also serves to retain the tube in position and prevents its accidental disengagement.

The resistance coll/2, comprises a hollow or open cylindrical core 6, which is prefer ably constructed of fiber, having wound thereon a desired number of turns of wire. The completed coil is thoroughly coated with a suitable non-conducting and noncombustible compound so as to render it thoroughly efiicient in its operation. The completed coil is "placed in the casing through the open end and a plug; 7 is detachecasing to retain the coil thereim The plug 7, is constructed of hard rubber or' of any other suitable insulating material, it is also provided with a longitudinally connector bushing8 similar in all respects to the hereinbefore described connector bushing 4. Extending through casing and body of the plug 7 is a set screw 9, which pro ccts into the connector bushing 8 serving as means for fastening the plug 7 in sition as well as a means for retaining t e ends of the wire in the tube and preventing the tube from becoming displaced. The heads of the set screws 5 and 9 are countersunk as illustrated in Fi 2 so as to rovide a uniform compact, cy indrical coi with no breakable or projecting parts thereon.

The terminals of the coil 2 are welded, or in any other manner suitably connected to the brass tuliings or bushings 4 and 8 and the bushings are so disposed as to be in alincrncnt and connnunicating with the open or hollow core of the coil as clearly illustrated in Fig. 2. As the tcrminals of the circuit wircs do not entirely close or fill the tubes 4 and 8, it will be seen that a circulation of the air will be permitted through the center of the coil at all times which will prevent the overheating of the coil thereby assuring a longer life therefor, and a more efficient operation thereof.

When it is desired to use the device in circuits requiring a large resistance it is mcrcly necessary to remove the set screws 5 and E).-tal-:c out the plug 7, remove the coil 2 and substitute one of the desired resistance after which the plug is replaced and the device may be then utilized as before, it being mcrcly necessary to insert the terminals of the lighting circuit into the conncctor bushings 4 a nd 8 and tighten the set screws.

\Vhilc l have illustrated in the accompanying drawings, and described in detail, certain specific neiterials and forms which enter into the construction of my invention I desire it to be understood, that I do not intend to limit myself to this, as these merely form the preferred embodiment of the invcntion, but any changes may be made in the details of the same which will fall within the scope of the invention as claimed.

I claim:

1. A device as described comprising a cylindrical casing, a resistance coil disposed therein, a plug removably engaged in one end of said casing to retain,tbe coil therein, connector bushings in said casing and plug, connection between the terminals of said coil and bushings, bushing retaining means in the casing, said means serving also to hold the plug in engaged position.

2. In a device as described, a hollow substantially cylindrical insulating casing, a resistance coil having a hollow core disposed therein, a removable plug in one end of the casing, and circuit terminal receiving bushine's extending through said casing and plug in communication with the core of said coil to pcrnnt circulation of air thercthrough and prevent overheating of the coil, and connections between said bushings and the terminals of said coil.

3. A device as described, comprising a hollow substantially cylindrical insulating casing having an open end, the other cud of said casin being provided with an aperture, a resistance coil disposed in the interior of said casing. plug detachably mounted in the open end of the casing, connector bushings in said closed end of the casing and through said plug in connection with the terminals of said coi wire retaining members in the casing and extending into said bushings to prevent displacement thereof. one of said members extending through said casing into said plug connector bushing to engage and retain said plug.

4. In a device as described, a hollow sub stantially cylindrical -asing having an open end, the other end of said casing being provided with an aperture, a resistance coil having an open cyl ndrical fiber core disposed in said casing through said open end, an insulating plug to be removably engaged in said open end to retain the coil in saidcasing, said plug being provided with an opening, metal tubes extending longitudinally in'said openings in said casing and plug respectively and communicating with the core of said coil thereby permitting air to circulate therethrough, connection between said tubes and terminals of said coils, set screws extending laterally through said casing and into said tubes for clamping circuit terminals therein and holding said tubes in position and one of said screws extending through the casing plug and adjacent tube whereby to hold the said plug in engagement.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ISRAEL MARCUS. Witnesses:

Puma J. MCMURRER, Cnas. O. HosTEaMAN. 

